From Wikipedia: A live action role-playing game (LARP) is a form of role-playing game where the participants physically act out their characters' actions. The players pursue goals within a fictional setting represented by the real world while interacting with each other in character.

From Wikipedia: Cosplay, a portmanteau of the words costume play, is a performance art in which participants called cosplayers wear costumes and fashion accessories to represent a specific character or idea.